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   Xu, Chengshuo ; Mazloumi, Abbas ; Jiang, Xiaolin ; Gupta, Rajiv ( June 2022 , Journal of parallel and distributed computing)
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3. Nested Sparse Feedback Codes for Point-to-Point, Multiple Access, and Random Access Channels

   https://doi.org/10.1109/ITW48936.2021.9611385  

   Yavas, Recep Can ; Kostina, Victoria ; Effros, Michelle ( October 2021 , 2021 IEEE Information Theory Workshop (ITW))
4. Exceptional Point of Degeneracy as a Desirable Point of Operation for Oscillator With Discrete Nonlinear Gain and Radiating Elements

   https://doi.org/10.23919/USNC-URSINRSM57467.2022.9881400  

   Mealy, Tarek ; Nikzamir, Alireza ; Abdelshafy, Ahmed F. ; Capolino, Filippo ( January 2022 , 2022 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM))

   An oscillator made of a periodic waveguide comprising of uniform lossless segments with discrete nonlinear gain and radiating resistive elements prefers to operate at exceptional point of degeneracy (EPD). The steady-state regime is an EPD with π phase shift between unit cells, for various choices of small signal gain of the nonlinear elements and number of unit cells. We demonstrated this fact by monitoring both current and voltage across each nonlinear gain element and finding its effective admittance at the oscillating frequency and checking the degeneracy of the eigenmodes at such point. The EPD studied here is very promising for many applications that incorporate discrete distributed coherent sources and radiation-loss elements. Operating in the vicinity of such special degeneracy conditions may lead to potential performance enhancement in the various microwave, THz and optical systems with distributed gain and radiation, paving the way for a new class of active integrated antenna arrays and radiating laser arrays. 

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5. Lossless Source Coding in the Point-to-Point, Multiple Access, and Random Access Scenarios

   https://doi.org/10.1109/ISIT.2019.8849742  

   Chen, Shuqing ; Effros, Michelle ; Kostina, Victoria ( July 2019 , 2019 IEEE International Symposium on Information Theory (ISIT))

   This paper treats point-to-point, multiple access and random access lossless source coding in the finite-blocklength regime. A random coding technique is developed, and its power in analyzing the third-order coding performance is demonstrated in all three scenarios. Results include a third-order-optimal characterization of the Slepian-Wolf rate region and a proof showing that for dependent sources, the independent encoders used by Slepian-Wolf codes can achieve the same third-order- optimal performance as a single joint encoder. The concept of random access source coding, which generalizes the multiple access scenario to allow for a subset of participating encoders that is unknown a priori to both the encoders and the decoder, is introduced. Contributions include a new definition of the probabilistic model for a random access-discrete multiple source, a general random access source coding scheme that employs a rateless code with sporadic feedback, and an analysis demonstrating via a random coding argument that there exists a deterministic code of the proposed structure that simultaneously achieves the third- order-optimal performance of Slepian-Wolf codes for all possible subsets of encoders. 

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